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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b76c07178dbee157e03e1cf3d7fd6f931748e487f0cf92a35ae8d430eac43798' 
  AND token = 'NxiwfpE1Dc9WXTCORJGwz5tQrH3JlWnwaPy/6/xnuQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}